The rSports Portable Book, Tablet and PDA Holder for Treadmills. Tired of staring into space or watching mindless TV during daily sessions on your treadmill, elliptical machine, stair master and similar equipment designed to keep you in shape? The rSports treadmill book holder is the answer to avoiding workout boredom. Use your workout time to catch up on studying, review important articles, continue reng a best-seller novel or other productive mind exercise. With two shelf depths it fits most commonly used exercise equipment consoles (but check yours first). In stock, ready for shipment.